The influence of dietary aminoacids on lead absorption

The effect of ascorbic acid and garlic administration on lead-induced apoptosis in rat offspring's eye retina

INTRODUCTION

Lead toxicity induces retinal cell apoptosis. Vitamin C and garlic may decrease lead-induced apoptosis. This study was undertaken to investigate vitamin C and garlic protective effects on lead-induced apoptosis in eye retina.

METHODS

Pregnant Wistar rats (n = 72) were divided randomly into 9 groups: (L) treated rats with lead acetate in drinking water and (L+AA) with leaded water and vitamin C intraperitoneally;(L+G), the rats received leaded-water and garlic juice via gavage; (L+AA+G) treated rats with leaded water, ascorbic acid, and garlic juice, (AA) with ascorbic acid, and (G) with garlic juice; (AA+G) treated rats with vitamin C and garlic juice and (Sh) with tap water plus normal hydrogen chloride (HCl) and glucose; normal (N). After 21-day lactation, blood lead level (BLL) in rats was measured, and then their offspring and the rat offspring's eyes were removed and processed for using TUNEL method. TUNEL positive cells in the eye retina were counted and all groups were compared.

RESULTS

BLL increased in L group compared to the control groups and decreased significantly in L + G, L + AA, and L+ AA + G groups compared to L group (P<0.05). TUNELL positive cell number in eye retina significantly increased in L group compared to control groups (P<0.05) and decreased in L+ G, L+ AA, and L+AA + G groups compared to L group (P<0.05).

CONCLUSION

Garlic juice and ascorbic acid administration during pregnancy and lactation may protect lead-induced apoptosis in rat offspring's eye retina.

Effect of garlic along with lead acetate administration on lead burden of some tissues in mice

Garlic ability to reduce lead burden in body tissues before and during chronic lead toxicity was studied. Eighty mice were divided into 8 groups. Group D received placebo. Groups A1, A2 and A3, respectively received 500, 250 and 125 mg kg(-1) day garlic and Groups B1, B2 and B3, respectively 1/4, 1/8 and 1/16 garlic tablet kg(-1) day in first four weeks and in second four weeks they received 5 mg kg(-1) day lead acetate plus garlic or garlic tablet. Group C received placebo in first four weeks and in second four weeks they received 5 mg kg(-1) day lead acetate and placebo. Reduction in lead burden of kidney, liver, bone and blood (except for group A3) in experimental groups was significant compared with group C (p<0.05). Results showed that fresh garlic extract and garlic tablet had almost same effects on lead reduction in tissues.

Effect of garlic (Allium sativum L.) extract on tissue lead level in rats

The prophylactic efficacy of garlic (Allium sativum L.) extract to reduce tissue lead (Pb) concentration was evaluated experimentally in rats. Thirty female rats were divided into five groups, keeping group A as a healthy control. Rats of groups B, C, D and E received lead acetate orally at the rate of 5 mg per kg body weight daily for 6 weeks. The garlic extract was tried in three doses, viz. 100 (low), 200 (medium) and 400 mg (high) per kg body weight orally and given simultaneously with lead salt to the rats of group C, D and E, respectively. Mean blood lead concentrations in lead-exposed rats ranged between 0.13+/-0.02 and 0.96+/-0.06 microg/ml, whereas in garlic-treated rats, the range was between 0.16+/-0.01 and 0.80+/-0.05; 0.13+/-0.01 and 0.71+/-0.06 and 0.14+/-0.01 and 0.60+/-0.05 microg per ml in low, medium and high dose groups, respectively. The mean lead concentration in liver, kidneys, brain and bone of lead exposed rats was 2.943+/-0.206, 4.780+/-0.609, 1.019+/-0.100 and 44.075+/-2.60 microg per ml, respectively. Concomitant use of garlic extract at the three different doses was found to reduce lead concentration considerably indicating the potential therapeutic activity of garlic against lead.

The bioavailability of iron, lead and cadmium via gastrointestinal absorption: a review

The primary route of entry of essential metals and most pollutant metals into the body is by gastrointestinal absorption. Although intraluminal factors influence the bioavailability of metals, the major control level of absorption probably resides in the intestinal mucosal cell. Interrelationships between various metals may effect their bioavailability at both the luminal and mucosal levels. It has also been shown that the nutritional status may have a profound influence on the absorption of some metals; iron, calcium, and protein deficiency may enhance the absorption of several pollutant metals, although this is apparently not simply an increased gut permeability to all heavy metals. Valid speculations regarding the absorption of pollutant metals is difficult since, even after several decades of intensive study, the precise mechanisms of controlling the absorption of iron and other trace metals are unknown.